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<html>
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    <meta charset="utf-8" />
    <title></title>
    <style type="text/css">
        #p1 {text-decoration: underline;}
        #p2 {text-decoration: line-through;}
        #p3 {text-decoration: overline;}
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<body>
    <p id="p1">这是“下划线”效果</p>
    <p id="p2">这是“删除线”效果</p>
    <p id="p3">这是“顶划线”效果</p>
</body>
</html>